Body and fender jack



2, 1952 E. M. ZINKE BODY AND FENDER JACK Filed Oct. 51, 1949 INVENTOR ERWl/V MAX Z/IV/(E flwm ATTORNEY Patented Dec. 2, 1 .952

UNITED STATES PATENT OFFICE BODY anion" Application October 31, 1949, Serial No. 124,712

4 Claims. 1

This invention relates to an improved rubbercovered head'ior body jacks and the like.

'Ihe invention has solved several problems. One of these has arisen because of the considerable pressures that are placed on the heads of such tools as body jacks. The trouble has been that these pressures have often been directed at an angle to the axis of the rubber-covered heads, and the direction and intensity of the force has often wrenched the rubber covering off its metal support or base, thereby rendering the head useless.

The problem has been solved by the present invention, which employs a novel metal base member to which is bonded a novel rubber covering. The base is flared outwardly to a stub end on which e. series of concentric ribs and recesses are provided. The rubber covering is thenvulcanized or otherwise bonded to the base around this flared end. The rubber fills all the recesses and mates with the up-and-down surface of the flared end. Shearing forces merely result in the rubber ridges (formed where a recess in the metal was filled) being forced against the metal ribs on one side or other of the recess, depending on the direction of the force, and the rubber covering is not torn off.

Another problem that has existed with rubber-covered heads for tools like body jacks has been that different types of work have demanded different forms of rubber coverings. With some types of work a rounded, ball-like surface is neeessary, and a flat surface would be objectionable. With other types of work a rounded surface will slip off. Heretofore this has means that the mechanic had to carry around two types of heads, one round and the other flat, and replace one with the other at frequent intervals, according to the type of work.

The present invention has solved that problem by providing a single head that will satisfactorily perform both types of work. The rubber-covered head of this invention has a central, rounded, ball-like portion that is surrounded by a convex, annular rim. The central portion accommodates surfaces that demand a rounded head, while other types of work can be supported by the edge of the head, adjacent the groove-like portion that joins the rim to the central portion. There is no slippage; in fact the rim portion holds work better than a fiat surface did. Since both types of work can be accommodated, there is no need for two types of heads, and the time that would be taken in replacing one type with another is saved.

end of one of the heads, taken Other features of the invention will appear from the following description of a preferred embodiment thereof. It is to be understood that the detailed presentation of this preferred form of the invention is given in compliance with United States Revised Statutes, section 48188, as an illustrative example, and its description is not intended to narrowly limit the invention. The scope of the invention is defined by the appended claims.

In the drawings:

Fig. 1 is a view in elevation of abody j ck,

having at each end a rubber-covered head that embodies the principles of this invention;

Fig. 2 is an enlarged view lookingtoward the in the direction of the arrow 2 in Fig. 1.

:Fig. 3 is a view in section taken along the line 3-3 in Fig.2; a portion only of the extension fitting being shown in dot-dash lines.

Fig. 4 is a view in section taken along the line 4-4 in Fig. 3, with the rubber removed from between successive concentric ribs in the metal base, to show the ribs and the depressions between them more clearly.

In order to illustrate the utility of the invention, it is shown as applied to a body jack [0 (see Fig. l). The jack l0 may be used to push two objects apart: for example, a dented automobile fender may be straightened by pushing it out with one end of the jack [0, the other end of the jack l0 meanwhile resting against a frame member of the automobile.

The jack Ill includes a body II, having bushings l2, l3 at its two ends. A tubular fitting l4 may be threaded into the bushing l2 at one end, for the purpose of extending the length of the ack, and a rubber-covered head [5, of the type embodying the principles of this invention, may be threaded on the outboard end of the fitting l4. Another head l5 may be threaded on the outboard end of a jack rod [6, which is the moving member of the jack l0. When the handle I! is moved back and forth the rod [6 will move to the left in Fig. 1, and. the two heads 15 will force apart the objects which they rest against.

The rubber-covered head I5 is shown enlarged and in detail in Figs. 2 through 4. It includes a metal base 20 and a rubber covering 30 vulcanized or otherwise bonded to the base 20.

The base 20 may be made from aluminum or other suitable metal. It has a threaded socket 2| at one end to receive the fitting M or red It. Its other end is flared outwardly at 22 toward a stub end 23. (See Fig. 3.) Both the flared por- The covering 30 has been referred to as rubber. By that term, wherever used herein and in the claims, it is meant to include not only natural rubber but also synthetic rubber and all practicable rubber substitutes.

Preferably the covering 30 is formed by mold-- ing, directly on the base 20. It is vulcanized or otherwise bonded to the base 20, and is so formed that it fills all the surface features and irregularities of the base 20. It has concentric depressions that correspond with the metal ribs 24 and concentric ribs or ridges that correspond with the depressions 25. Any pressure against the head. i 5 will compact the rubber more firmly against the base 20, instead of tending to shear it off the base.

The end surface'of the head I5, which is the end surface of the rubber covering 36, is so constructed that it can accommodate a great variety of surfaces in the objects it may bear against. The central portion 35 is ball-shaped; that is, it is arcuate. A convex rim 36 encircles the arcuate central portion 35, the two portions meeting at the annular groove 31.

The arcuate portion 35 accommodates any surface that normally requires a spherically-shaped or rounded head. Other surfaces can be accommodated by the rim-portion 36, the groove 31 4 helping by enabling the adjacent part of the central portion 31 to be used as a side wall, thereby helping in alignment.

I claim: 1. A head for body tools and the like, including in combination, a metal base member having a,

threaded socket in one end and a flared portion at the other end terminating in a stub end having a surface formed to provide raised portions and depressed portions; and a rubber covering member surrounding the flared portion of said base and molded to conform to its surface features, said member being bonded to said base member.

2. The head of claim 1 in which said rubber covering member has an external end with a rounded central portion surrounded by a convex annular rim portion.

3. The head of claim 1 in which the surface features of said stub end comprise a plurality of concentric rounded beads.

4. A headfor body jacks and the like, including in combination a metal base having a flared portion at one end and a rubber covering bonded to said base and encircling said flared portion, said covering having at its outer end a rounded central portion surrounded by an annular convex rim. 7

ERWIN MAX ZINKE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 938,883 Maier Nov. 2, 1909 2,455,664 Ferguson et a1. Dec. '7, 1948 2,463,966 Hauschild Mar. 8, 1949 

